Geoege e



(No Model.)

G. R.,ROOT.

n W l V6 fr NITED STATES PATENT GFF-Ica.

GERGE R. ROOT, OF INDIANAPOLIS, INDIANA.

CUAL-BREAKER.

@PECIFICATION forming part of Letters Patent No. 342,811, dated June l, 1886.

Appli. ation tiled February 8, 1886. Serial No. 191,153. (No model.)

4.To all whom it. may concern:

Be/it known that I, GEORGE R. ROOT, a citizen of the United States, residing at Indianapolis, in the countyof Marion and State of Indiana, have invented a new and useful Improvement in Coal-Breakers, of which the following is a specification. l

My invention relates to an improvement in a machine for crushing coke, for which Let ters Patent No. 179,612 were issued to me .Iuly 4, 1876. In the machine above mentioned each of the crushing-rolls between which the coke is broken consists of a pair of circular heads mounted on a shaft, and arranged to support on their peripheries opposite ends of a series 0f bars, which are tapering in cross-section from the outside inward, and are arranged with open spaces between them, thus forming a hollow skeleton cyliir der. A pair o'tsuch rolls are mounted in a suitable frame and connected by gear-wheels,

so as to revolve simultaneously, and the crushing-bars are relatively so arranged that the bars of one roll force the crushed coke through the intervals between the hars ot' the other.

The object of my improvement is to adapt hollow rolls to crush anthracite coal and other like hard substances. It is important for this purpose that the crushing-bars be very strong and well supported, and that the bars, when broken, may be easily repaired. I attain these results bythe construction illustrated in the accompanying drawings.

Figure l represents a plan ot' my improved coal-breaker. Fig. 2 is a vertical section ol" the same. Fig. 3 is an enlarged side elevation of one of the roll-sections. Fig. 4t is a longitudinal section of one of the rolls. Fig. 5 is a sectional view of a modified form of the roll-section.

A and B are a pair ol' hollow rolls having their peripheries formed into alternate projecting longitudinal bars c and spaces d, which spaces are wider on the inside than on the outside, and communicate with the interior of the rolls. Said rolls are mounted with their peripheries near together, but not touching, on suitable shafts, e and j', in hearings on a supporting-frame, D. A drivingpulley, P, is secured on shaft e, and a pair of intermeshing spur-gears, f and g, are secured to the respective shafts, so that they may be revolved simultaneously, the arrangement being such that the bars of one roll will come opposite the spaces in the other, as shown in my before-mentioned Letters Patent. The rolls A and B are each formed of a series of sections like that shown in Fig. Saidsec tions consist of a hub, It, a thin annular ring, fi, armsj, connecting the ring and hub, and a series ol" radial ribs, 7.', projecting laterally from one or both sides ol' the ring, and projecting radially beyond its periphery, all of said parts being cast in one piece. Said radial ribs taper from the outside inward, and are arranged at regular intervals, 'so as to form spaces d, which are wider on the inside, for the purpose of allowing-the broken particles ot' coal to pass easily into the roll. A central hole, m. is formed in each section, and also a hole, a, in each arm. To form a roll a shaft, c, is passed through the central holes in a series ofthe above-described sections, the sections being arranged so that the ribs kand holes a of each are opposite. The sections are then fastened together by bolts b, passed through the holes a otthe several sections. The outside or end sections are then secured to the shaft by keys or in any suitablemlanner.

In operation the coal to be broken is introduced `between the revolving rolls, and is broken into small pieces. As there is op posed to each ofthe bars c, formed of the successive ribs lc, a space communicating with the interior of the opposite roll, the broken particles of coal escape through said space as soon as reduced to the required size. Clogging ofthe rolls and excessive waste are thereby avoided. When any portion of the roll becomes broken or worn out, the sections forming that particular part are easily removed and new ones substituted.

I claim as my inventionl. In a coal-breaker, the above-described improved roll-section,` consistingl of a thin annular ring, a central hub, a hole in said hub, arms connecting said ring and hub, and a series of tapering radial ribs projecting radially and laterally from the ring, and arranged to form spaces between the ribs, said spaces having their maximum or greater width toward the hub, for the'purpose specified.

IOO

2. yIn a coal-brcakcr, a roll formed of. a scries of like roll-sections secured together side by side upon a central shaft, each of said sections consisting of a. thin annular ring, a cen 5 tra] hub a holein said hub, and aseries of tapering radial ribs projecting radially and laterally from the ring, said sections being arranged so that thcii` radial ribs form continnous longitudinal. bars with spaces between them communicating with the interior o f the io roll, substantially as and for the purpose specified.

GEORGE R. ROOT.

Vitnesses:

I-I. P. H001), V. M. Hooi). 

